CVE-2025-4120
Published: 30 April 2025
Summary
CVE-2025-4120 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Netgear Jwnr2000V2 Firmware. Its CVSS base score is 8.7 (High).
Operationally, ranked in the top 19.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2025-4120 is a buffer overflow vulnerability in the Netgear JWNR2000v2 router firmware version 1.0.0.11, specifically in the function sub_4238E8. The flaw arises from improper handling of the host argument, which can be manipulated to trigger memory corruption. It is tracked under CWE-119 and CWE-120 and carries a CVSS 4.0 score of 8.7, reflecting high impact on confidentiality, integrity, and availability when exploited over the network.
An authenticated remote attacker can supply a crafted host value to the affected function and achieve arbitrary code execution or a denial-of-service condition on the device. The attack requires no user interaction and can be launched directly across the network.
Public references, including a detailed disclosure on GitHub and entries in Vuldb, indicate that Netgear was notified prior to publication but provided no response or patch. No official mitigation guidance or firmware update has been issued by the vendor.
The associated EPSS score remains flat at 0.0133 with no observed increase after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-12716
Vulnerability details
A vulnerability was found in Netgear JWNR2000v2 1.0.0.11. It has been classified as critical. Affected is the function sub_4238E8. The manipulation of the argument host leads to buffer overflow. It is possible to launch the attack remotely. The vendor was…
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contacted early about this disclosure but did not respond in any way.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Managed runtimes used by platform-independent applications (e.g., JVM, CLR) enforce memory safety, preventing most buffer overflows that require direct memory manipulation.
Ongoing control assessments and code testing (static/dynamic analysis, fuzzing) surface memory buffer restriction failures, which are then remediated before release.
Memory protections (e.g., W^X, ASLR) make exploitation of buffer-boundary violations far harder to turn into code execution.
Detects exploitation attempts that produce memory corruption, crashes, or anomalous behavior.